Protesters dressed up as Apple Store employees in telltale blue t-shirts marched in front of the Union Square store Tuesday morning, calling on Apple to pay taxes on the $102 billion they said the company holds overseas.

The protest called on tech’s ethos of making the world a better place. Flyers handed out at the protest to shoppers passing by the store pointed them to www.techcandobetter.org, which pushes for better wages for security guards at tech companies.

SEIU USWW, the union that organized the march, represents security guards and janitors at many companies, not just tech, in San Francisco and the East Bay.

But Tuesday’s event appealed to tech companies’ moral goals, which have become more relevant as other activists call for the rapidly growing companies to give back to the cities they affect, ranging from other union demonstrations outside of Twitter to activist-led marches on Google employees’ houses.

“We’re trying to have a little fun on Tax Day and show how Apple’s unpaid tax revenues could help Bay Area infrastructure,” said Alfredo Fletes, the union spokesman. “We could have done this in Cupertino, but not as many customers would come by — this is partly an education campaign.”

The store entrance is partly obscured by major Central Subway construction, leaving protesters just a narrow sidewalk to march on. The store did not close for the protest, which lasted about 30 minutes.